Here's a question (and this is just out of an observational point of view, I'm not proclaiming in any way to be in that מדרגה, although I wish I was) but here goes --
How many people here criticizing the guy posting that paper, do not interact with their sister in laws -- which according to all פוסקים is not allowed since there's a קירבות?
I assume not even one.
Point being -- if you're the guy passing red lights at intersections all the time, you're not really the guy to be criticizing a safe driver.
Not to sound like I'm bragging (I don't think this is something worth bragging over) but in my family there is indeed minimal interaction between brothers and sisters in law, so I definitely hear where you are coming from.
As I said earlier, I have no problem if someone doesn't want to look at pictures of women dressed inappropriately (or even appropriately), the question is how will you deal with it. Will you just look away (or cover it up if it's really in the way) or make a whole shturem which is a) ineffective and b) counter productive.
Someone compared covering the images to slapping on a band-aid, well guess what? If you have a pimple the best way to deal with it is to ignore it or, if ignoring is too hard, cover it up. Picking at it will, not only not heal the pimple, it will make it worse and draw more unwanted attention...